Method of shaping abrasive paper.



921 028 Patented May 11,1909.

e. s. TBNNEY. METHOD OF SHAPING ABRASIVE PAPER.

APPLICATION FILED JUNE 1, 1908.

UNITE sTATEs PA'IE'I EEoE.

GEORGE s. TENNEY, OE, wALro LE, MASSACHUSETTS, ASSIGNOR TO AMERICAN GLUE COMPANY, or BOSTON, ASSAOHUSETTS, A CORPORATION OF MASsAoHUSETTS.

METHOD OF SHAPING ABRASIVE PAPER.

To all whom it may concern: 7

Be it known that I, GEORGE S. 'IENNEY, of i i alpole, in the county of Norfolk and State of Massachusetts, a citizen of the United- States, have invented a new and useful Method of Shaping Abrasive Paper, 'of which the following is a specification.

Abrasive paper wrapped around the rim of a rotary wheel is used for smoothing or polishing the edges of boot and shoe heels and for a variety of other purposes, the rim of the wheel to which the paper is attached being shaped according to the shape of the surface on which it is to be used.

I/Vhile paper has been prepared in long strips of the proper width and shaped to fit convex-rimmed wheels and is sold in rolls from which the purchaser can cutoff pieces of the right length to fit his wheel, the same is not true of abrasive paper for concaverimmed wheels. Such paper so far as I know has always been fitted by the user as needed. While damp it has been wrapped about the wheel and shaped and dried while in place. This requires considerable time, but until my invention no way has been devised for supplying the market with what may be termed a ready-made concaved strip, and in fact it was only after considerable experimenting thatI was enabled to make a marketable commodity'of this kind.

My invention therefore relates to the preparation of long strips of abrasive paper which can be supplied to the trade in rolls as a commercial article, and it consists in passing the strip while damp progressivelybetween an entering and receiving die whereby while the edges maintain their original condition, the intermediate portion will be crimped'more or less; and compressing the crimped portion so that the strip as a whole wil maintain its new shape and thendrying the strip.

Then the receiving die is given the shape of the concave surface of the rim of the wheel, the strip takes the shape of the wheel, its Outer edges being held from stretching, and its middle portion being shortened according to the depth of the concave. The middle portion is crim ed during this shortening process and so ong as it'is damp it tends to lengthen'out again'but when compressed under heavy pressure it sets into its Specification of Letters Patent.

Application filed June 1, 1908.

new shape and is dried,thus maintaining the strip when dry in concave form in cross sec- Patented May 11, 1909.

Serial No. 435,933.

tion and convex form in longitudinal section. llhen the receiving die is itself a wheel the strip is given a longitudinal curvature which causes it to wind easily both in a roll for sale and on thebufling wheel.

TO carry out my method any Sim le form of mechanism will answer which wil provide for the operations above referred to. The strip must be fed as well as shaped and I therefore have found it simpler to provide as the receiving die a power operated wheel having a suitable Shaped rim which being rotated serves not only as a die for the shaping both concave andv convex, but a portion of a feeding mechanism, and for an entering die which should also serve as a portion of a feeding mechanism I have found a belt useful as if suflicient ressure is applied to make it fairly taut, its eiribility causes it to enter the receiving die and shape the strip to the shape ofits rim, while at the same time it allows the ironing process to be applied through it. p r

T0 compress the crimps any ironing means 'may be used but as it is advantageous to have thisstep in the process carried on at substantially the same time as the other steps I have used a roll having a narrower rim than the rim of the receiving die which consequently maybe caused to bear under heavy pressure along'the central line of the belt and exert its pressure through it upon the strip while the strip is between the dies and so accomplish the desired result.

I have shown in the drawings an assemblage of the parts above referred to by which the shaping of the strips may be accomplished. I

In the drawings Figure 1 is a plan view, and Fig.2 a side view of a mechanism to carry out the shaping of the strip.

A is the table on which is mounted a frame A in which is journaled three shafts B C D Bis a driven roll mounted on the shaft B to which power is applied. In the drawing a crank handle B is shown attached to this shaft but in practice a power wheel would be used.

G is a tension roll mounted on the shaft C and connected with the roll B by means of the belt E. The shaft 0 is mounted in a yoke F and the ends of the shaft pass through slots a, a in the table A and frame A. l he Wound upon another roll, not shown.

yoke F is connected by a linkf with a lever f pivoted at f 2 to the table A. From the outer end'of the lever is suspended a weight f so that a constant tension is maintained upon the belt E through the roll C. The roll D is mounted on the shaft D and serves as supply roll upon which the strip of sandiaper is drawn off to run between the belt it and the power roll D so that in so far as the weightf exerts tension upon the roll G that tension is maintained through the belt E upon the strip during its process of formation. The free end of the strip as it comes off the roll B is preferably carried off and The roll B and belt E therefore form receiving and entering dies between which the strip is shaped and also serve to feed the strip.

H is a pressure roll the edge or periphery of which is considerably narrower than the periphery of the roll B (see Fig. 2-) and although convex in cross section it is curved on a much shorter radius than is the groove in the roll D so that it bears upon the central line of the roll B. This roll is mounted on a stud it carried by the arm J which is pivoted at j to the table A.

7' is a bracket mounted on the table A and K is a screw carrying a nut 75. Between the end of this screw which carries a suitable collar k and a projection 732 on the arm J lies a spring the compression of w iich may be adjusted by means of the hand wheel 75 so that by means of this hand wheel a consider able pressure may be brought to bear on the axis of the roll H to compress it against the belt E. The pressure may be raised to as high as 400 or 500 pounds, such pressure being necessary at times when the belt and strip are thick. About 400 pounds is usually sufficient for the purpose.

My process as carried out with the assistance of these parts is as follows: The abrasive paper is usually made in a web of considerable length and say two feet wide. This paper is first dampened so that its fibers are brought to the proper temper to work, and being cut into strips of proper width a strip is fed to the roll B and between it and the belt E. The roll H is next put into engagement with the belt and the spring 7c is ad justed to exert the necessary pressure upon the strip after which power is applied to the roll so that the, strip is simultaneously shaped and fed and the crimps are ironed. The pressure needed for ironing is ordinarily in the neighborhood of 400 pounds and this is applied to the central line of the belt and acts through the belt upon the central line of the strip. The pressure of the belt upon the receiving die gives to the fibers of the strip the shaping and compression which are necessary to produce the desired change in the cross section or" the strip, for the belt being flexible and more or less elastic conforms under pressure to the shape of the groove in the roll A and presses the engaging portion of the strip against the concave rim of the wheel, preventing buckling of the edges and giving them their necessary smoothness. This action not only removes the strip in cross section, but curves it longitiulinally and in so doing shortens it slightly so that it is crimped along a line between the edges. By applying pressure along this line the crimps are ironed out as above described. it will be noticed that this (mcration is a gradual shaping, the first shaping being given by the belt along as the strip enters between it and the receiving die and the shaping being (ZOHIplClV-Qd by heavy pressure applied later on the central line of the strip while the strip is held between the receiving die and the entering die.

In referring to this mechanism l do not mean to limit myself to its use in carrying out my process. That process consists in molding a moving strip of paper by means of dies and at the same time compressing or ironing the central line of the strip to make the crimps which it will contain. it is cvi dent that a strip which is concaved on one side is convex on the other, so in using the term concave ll do not mean to confine myself to a strip adapted to fit into a concave recess although that is the use to which the paper above described is ordinarily put. Jlhile this process is especially designed for shaping abrasive paper it may be used for shaping any kind of paper.

Vi hat I claim as my invention is:

1. The method of shaping a ilat strip of paper which consists in first tempering the paper and then passing it between a receiving die and an entering die whereby a heavy pressure is given to it along the line of contact of said dies and at the same time compressing the crimps caused by the action of said dies whereby they will be flattened and then drying the strip.

2. The process of molding a strip of paper into concave form which comprises temper ing the paper and then passing it between two forming surfaces, one being concave in cross section and the other convex in cross section, and simultancmisly compressing the middle line of said strip.

3. The process of molding a strip of paper into concave form which comprises tempering the paper and then passing it lmtwccn. forming surfaces, one of which is concave, and in addition compressing it along the median line by a surface the radius of convexity of which is shorter than the radius of concavity of the concave surface, as described.

l. The process of molding a strip of paper into concave form which consists in lirst tempering it and then forming it between a concave die, a iiexiblc convex die, and convex die having a rigid surface where the rigid Til lllll convex die is narrower than the concave die, whereby pressure will be applied to said paper along its entire length and width, and additional pressure along its central line, as described.

5. That im rovement in the art of shaping paper or the 'ke Which comprises first tempering the paper, then sha ing it between dies whereby its edges Wl maintain their normal length and the intermediate portion will be crimped and then compressing the crimped portion whereby the strip will maintain a concave shape in cross section, as set forth.

6. In the art of molding a paper strip, a concave die, a flexible convex die and a narrow convex die adapted to apply additional pressure through said flexible convex die to'a narrow portion of said strip.

7. That recess of molding a strip of paper to curveit ongitudinally and also to convex it in cross section which consists in passing it over a-Wheel having a groove in its rim and betweensuoh rim and a flexible belt and at the same time applying additional pressure at one or more oints on the median line of said belt Where y crimps along the median line of thestrip Will be flattened, and then drying the strip.

GEORGE S. TENNEY.

Witnesses:

ROGER UPTON, A. E. DOANE. 

